<%=form_remote_tag(:update => "image_list" ,
                   :url => { :action => :get_images_list},
                   :complete => "Element.remove('picture_finder_help')" ) %>
  <label for="guess" >Search by comment: </label>
  <%= text_field_tag :query %>
  <%= submit_tag "Go" %>
<%= end_form_tag %>
<p id="picture_finder_help">
  Look for the images here, once you have chosen the search criteria and clicked the <em>Go</em> button.
</p>